So if thats the case
if the opponent is using a machamp deck, i should attach Unown G on a SP pokemon
but if the opponent is using a gengar deck, i should attach Unown G on a pokemon which has a poke-power, right?
^except for stuff that deals with the opponent, like:
your OPPONENT cannot use poke-powers next turn, or your OPPONENT discards 1 card from their hand.
Unown G is good due to the amount of playable cards that have attack effects it prevents. Here's a quick run down of what it can do for you:
Dusknoir SF #2 Damage Even: Completely prevented
Gengar SF Shadow Room: Completely prevented
Dialga G Lv.X Remove Lost: Energy can not be sent to lost zone
Machamp SF Take Out: Basic Pokemon are immune
Gardevoir Lv.X Bring Down: Completely prevented
Shiftry RR Seal Off & Conform: Powers and Bodies still usable, no confusion
Gallade SW Sonic Blade: Completely prevented
Blazkein PT Clutch: Can retreat
Giratina Lv.X/PT #27 Darkness Lost/Broken Time-space Blow: Not sent to lost zone
Magnezone Lv.X Cyber Shock: Not paralyzed
Azelf Lv.X Deep Balance: Completely prevented
Azelf LA Lock Up: Can retreat